The influence of geometrical parameters of the forming channel on the boundary value of the axial force in the agglomeration process of dry ice

Abstract

The article presents the results of study on the influence of geometrical parameters of the forming channels on axial force which is the main parameter of the agglomeration process of dry ice in the piston method. During research, the material was agglomerated utilizing different dies. The material is characterized by low temperature and sublimation under standard environmental conditions. The study focuses on determining the influence of geometrical parameters of the conical and cylindrical sections of the forming chamber which influence the value of yield stress in the carbon dioxide agglomeration process. The determination of the value of boundary force is the basis for formulating the construction assumptions which shall be the basis for designing and constructing the dry ice compaction and pelletization machine.

Influence of the Extrusion Cavity Shape on the Ultimate Extrusion Force Value During Pellet Extrusion Through Multiple-Cavity Dies

“…For a spherical, convex, or concave convergent section, specify the radius value (R 1 or R 2 ) and the section's length (h 1 or h 2 ). In the case of the fourth type of channel, fixed from the connection of the two previous ones, it is necessary to determine the parameters for both sections independently or to ascertain the total length of the convergent section and define the proportion of each share, e.g., (CS), (d) with a convex section followed by concave section (CCS) [13] 1 to 1. The convex spherical compression section was left out based on the results of earlier studies that revealed problems with obtaining laminar flow of the material during extrusion and maintaining cohesion.…”

“…Figure 4. Shapes of the dies under analysis: (a) conical-cylindrical (CC), (b) with a convex spherical compression section, (c) with a concave spherical compression section(CS), (d) with a convex section followed by concave section (CCS)[13] …”

The Algebraic Model of the Dry Ice Extrusion Process in a Die with a Conical-Cylindrical Channel

“…It is used, among others, for food storage, water carbonization and freeze-drying of products [9,12,29]. Dry ice is also widely employed in abrasion cleaning of surfaces [15,30,40]. An important parameter defining compacted dry ice quality is its density.…”

Numerical Analysis of Dry Ice Blasting Convergent-Divergent Supersonic Nozzle

“…If pellets of smaller dimensions are required, they are run through a strainer. Dry ice is produced in a separate system [6], i.e., using the process described in [7] or on site [8] by conversion of liquid CO 2 to pellets with the use of a pelletizer. Once the pellets are loaded in the two-phase dry ice blasting machine, compressed air blasts them through a nozzle on to the cleaning surface [9].…”